[Functional][Admin/Job]Verify case insensitivity in vacancy search

[TimofiySharshevskiy]

Priority: Low

Preconditions

1. Admin is logged in.
2. Navigate to the “Вакансії” tab.
3. At least two vacancy records exist: One with title “test” One with title “Test”

Steps to reproduce

1. Navigate to the “Вакансії” page.
2. In the “Назва” search field, type “Test”
3. Observe the search results.
4. Repeat the search with the following variations:
   “test” “TEST” “TeSt”
5. Observe the search results after each variation.

Expected result For each search variation (“Test”, “test”, “TEST”, “TeSt”), the same set of results is displayed. Both vacancies titled “test” and “Test” appear in the results list. The search function treats the input as case-insensitive. Postconditions The search filter remains active until manually cleared. No data is modified.

User story: #836